a-a a-c a-t aaa aac aao aat aay ac- aca acc aco act acy aoa aoc aoo aot at- ata atc ato att ay- aya ayc ayo ayt c-- caa cac cao cat cay cca ccc cco cct co- coa coc coo cot coy cta ctc cto ctt cty cya cyc cyo cyt oaa oac oao oat oc- oca occ oco oct oo- ooa ooc ooo oot ot- ota otc oto ott oya oyo taa tac tao tat tay tca tcc tco tct to- toa toc too tot toy tta ttc tto ttt tty tya tyc tyo tyt yaa yac yao yat yay yca ycc yco ycy yoc yoo yot yoy yta ytc yto ytt yyc yyt yyy